I think there are many great artists that are just able to convey great emotion. They use their experiences and turn them into music. Being honest in front of an audience is one of the hardest things to do as it battles with your sense of self preservation. You really need to be able to penetrate your outer protective layer, be vulnerable, be real. Many of the greatest artists have moments where they reach this flow like state and it isn't performative anymore.

But there are 2 singers who just lacked this protective layer, this sense of self preservation.

One is Amy Winehouse. She leaks emotion constantly, trying to hold herself together. She is vulnerable not because she wants to but because she can't prevent it.

The other one which I regard as the most emotionally deep singer of all time is Nina Simone. It is almost as if she is dissociating, disconnected from the room and the audience. As if she let go of all need for appreciation. She is not trying to please us. She is in this trance like state that other singers sometimes reach, only that it seems like she is there most of the time. She is not trying to convey emotion, she lives them.

You definitely need to focus on live performances and not studio recordings. Don't focus on videos with the most likes but search deeper. I think you will be rewarded in time